This won't be a long one.
Just that in the current state of things, all kexts are now installed directly in /System/Library/Extensions/ and we no longer have EFI.
And since that is the case, I'm actually thinking if I'd want to use automated package installers when I configure my system from scratch because, by nature, I'm someone who'd very much prefer to be hands on and know exactly what happens and when that happens in my Mac OS X file system.
That said, I prefer using Lizard and Kext Utility to do the job for me very brilliantly.
Kappy is continuing the development of automated installers - yep, he has much more perseverance and talent and intelligence in figuring out Package Maker than I can ever hope to do - and has been posting packages for people to test.
As of now, direct installation in /S/L/E using automated package installers remains dodgy and one still has to run Kext Utility after running the installer to get things up to snuff.